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California condors attract researchers’ interest because they . ( )(本题2.5分)
A. are active at night
B. had to be bred in the wild
C. are found on in California
D. almost died out in the 1980s
A. are active at night
B. had to be bred in the wild
C. are found on in California
D. almost died out in the 1980s
参考答案